18446745135989 has 4 divisors (see below), whose sum is σ = 18476837706156. Its totient is φ = 18416652565824.

The previous prime is 18446745135983. The next prime is 18446745136063. The reversal of 18446745135989 is 98953154764481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4178107697764 + 14268637438225 = 2044042^2 + 3777385^2 .

It is a cyclic number.

It is not a de Polignac number, because 18446745135989 - 2⁸ = 18446745135733 is a prime.

It is a super-2 number, since 2×18446745135989² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18446745135983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15046284164 + ... + 15046285389.

It is an arithmetic number, because the mean of its divisors is an integer number (4619209426539).

Almost surely, 2^{18446745135989} is an apocalyptic number.

It is an amenable number.

18446745135989 is a deficient number, since it is larger than the sum of its proper divisors (30092570167).

18446745135989 is an equidigital number, since it uses as much as digits as its factorization.

18446745135989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30092570166.

The product of its digits is 1045094400, while the sum is 74.

The spelling of 18446745135989 in words is "eighteen trillion, four hundred forty-six billion, seven hundred forty-five million, one hundred thirty-five thousand, nine hundred eighty-nine".